PNEUMATIC RADIAL TIRES

摘要

A pneumatic radial tire is disclosed, which comprises steel cords having a two or three layer construction represented by a designation of ?+m or ?+m+n as a tire reinforcement, wherein two layers at a center side of a transverse section in the steel cord have the same twisting direction but different twisting pitches. In this steel cord, m filaments constituting an outer layer are arranged so as to enter into an inside of a circumscribed circle enveloping ? filaments of an inner layer at a non-contact region above a predetermined value and have a form ratio of 90-110%.